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New curb stone prefabrication

Jul 02, 2019

According to the thickness of the road surface layer and the type of the base layer, determine the thickness of the ordinary concrete on the road edge and the porous concrete on the lower layer, and consider the number and size of the culverts according to the local heavy rain intensity and the dredging conditions during use.


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人妻 制服 出轨 中字在线